The Montana Bureau of Mines & Geology (MBMG) developed this computer model showing Butte topography and the corresponding underground tunnels from the years of historic underground mining. The red dots at the surface and red lines below represent vertical shafts, and the colored lines under the surface represent the horizontal levels of the mines. The graphic does not illustrate stopes […]

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The 2013 print edition of PitWatch included the following photo from the Montana Bureau of Mines & Geology (MBMG), intended to show the current water level relative to the Critical Water Level. Some PitWatch readers asked for a version of this image that used a current photo of the Berkeley water level, and MBMG created this new image to better […]

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PitWatch reader Coleen Christensen pointed out this blog from the Smithsonian about a possible use for acid mine drainage stream waters. Streams near the Berkeley Pit were similarly impacted during historic mining activities. Read the full blog here.

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